from sympy.abc import s, t
from sympy.physics.control.lti import TransferFunction
from spb import *
tf1 = TransferFunction(1, (s+1), s)
ul = 10
graphics(
    line(t, (t, 0, ul), label="ramp"),
    ramp_response(tf1, upper_limit=ul, label="response"),
    xlabel="Time [s]", ylabel="Amplitude"
)